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='Nrrnn STATES PATENT Grinch.

Y VCLAV TOMSA, OF PRAGUE, AUSTRIA-HUNGARY.

MECHANICAL MOVEMENT;

SPECIFICATION forming part of Letters Patent No. 514,791, dated February 13 1894- Applicnnonniea Jnne'zo, i392. senin No. 437,392. (No man.) Patentgdin England May 2.3.1892,N0-91'735- To all whom it may concerne.

Be it known that I, VcLAv Toi/ISA, engineer, of Prague, in the Kingdom of Bohemia, Austria-Hungary, have invented a new and useful Improvement in Mechanical Movements, (which is protected by Letters Patent 1n Great BritaimNo. 9,735, of May 23, 1892,) of which the following specification, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to a new combination of mechanical elements, whereby'the continuous rotary motion, in either direction, of one shaft is converted into oscillatorymotion of one or more independent shafts; and whereby a short rest or stop is given to one or more of the independent shafts at every reversal of the machine.

My improved mechanism comprises essentially two shafts, (preferably extending in the same line) one of which, (the power shaft) is adapted to rotate continuously in either direction and be easily reversed from one direction to the other, while the other shaft is adapted to be oscillated by suitable intermediate mechanism. I may also employ one or more additional auxiliary shafts which receive an oscillatory movement from the intermediate mechanism.

My invention is applicable to any mechanism in which it is desirable to convert a continuous rotary movement into an oscillatory movement, but as a prominent application, I

have shown and described my invention applied to a sewing machine.

In order that my invention may be fully understood, I will iirst proceed to describe the same with reference to the accompanying drawings,.and will afterward point out the scope and novel features in the annexed claims.

In said drawings z-Figure I is alongitudinal sectional view of a portion of a machine showing the driving mechanism constructed according to my invention. Fig. II is a longitudinal sectional View of the other portion of the same machine. Fig. III is an inside sectional view taken on the line III-III, of Fig. I, and looking in the same direction indicated by the arrows.

neath view of the base plate or table of the machine. Figs. V, VI, VII and VIII are de- Fig. IV is an nndertail views of levers and eccentrics for transferring the motion to the several parts of my improved mechanism.

I employ two shafts a and c, each of which may move independently of the other. The shaft a may be supported at one end in the bearing d, and at the other end in a sleeve b, so as to rotate freely in both bearings. The other or oscillatory shaft c is carried at one end in a bearing g, preferably in line with the shaft a, and at the other end, it is fitted in and turns with the sleeve b, which latter is carried in the bearing f. The sleeve b may be pinned to the shaft c, as shown, or fastened in any other well-known manner.

On the rotary shaft o., (see Fig. 1,) are mounted two eccentric disks C, D, the former of which is loose on the shaft, while the latter is fixed to the shaft. The loose and fixed disks C and I) are provided with the tappets E and F respectively, as shown. These tappets serve to transfer the motion of the shaft a, by the tappet F to the loose eccentric disk C, and allow at each reversal of the shaft a, a short rest to the forked lever G, (see Figs. I, V, and VL) which embraces and is operated by the loose eccentric C, and which connects through a suitable link and cam lever O with the shaft C under the table (see Fig. IV) for oscillating it. The shaft C carriesa friction roller b' against which the cam O bears.` The ecce'ntric D, Iixed to the shaft a, gives the forked lever or eccentric'rod H a swinging or pendulous. vmovement on its pivot pin P, which is screwed to the bracket Q. The lower end of the lever H engages the forked end of the toothed sector lever R, which vmeshes with the spur pinion S, which latter may be keyed to a shaft or other device W which it is desired to oscillate. The shaft c is oscillated by thetransmission of the reciprocation of the lever Il tothe pivoted lever Z, by means of a pin V engaging in the slotted lower end of the lever Z. The lever Z, which is pivotally supported at U, is formed at its upper end with a segmental rack U which engages with the pinion, or cogwheel e, secured to or formed integral with the sleeve b, which is connected with theshaft c.

Whenmy improved mechanical movement is'applied to a sewing machine, as shown in the drawings, the following additions'are made. The usual hand wheel n is keyed to the outer end of the shaft a, and the disk h is secured on the outer end of the oscillatory shaft c, and provided with a pin t' projecting from its face, which pin engages in an undulating cam groove formed in a suitable guide plate Z attached tothe needle-bar k. By this means the needle-bar is reciprocated, as more clearly setforth in my divisional application filed April 5, 1893, Serial No. 469,202. The oscillating shaft C is suitably connected to the feed plate for reciprocating it, as more clearly pointed out in my divisional application filed August 8, 1893, Serial No. 482,768. The shuttle is operated by the oscillation of the pinion S, to which it is keyed, as clearly set forth in my application above-referred to, Serial No. 469,202.

With my improved mechanical movement, it will be seen that the rotary shaft may be run as well in either direction, and that upon a reversal of the shaft, the mechanism controlled by the loose eccentric will not be operated until the shaft makes nearly a com plete revolution.

Though I have shown my invention applied to a sewing maehine,I do not limit myself thereto, as the mechanical movement may be applied to any form of mechanism when it is desired to obtain the described motion.

Having thus described my invention, what l claim as new therein, and desire to secure by Letters Patent, is

1. The combination ofa rotatable shaft, an oscillatory shaft supported in suitable bearings in line with the rotary shaft, and suitable lever mechanism for transferring motion from the rotary shaft to the oscillatory shaft, substantially as set forth.

2. The combination of a rotatable shaft, an oscillatory shaft, a fixed cam mounted upon said rotatable shaft, and a suitable pivoted lever engaging said cam and geared to and adapted to operate said oscillatory shaft, substantiall y as and for the purpose set forth.

3. The combination of a rotatable shaft a, an oscillatory shaft c, a sleeve b secured to the shaft c and forming a journal forone end of the shaft a, and suitable gearing between said shafts for transferring the oscillatory motion to the shaft c from the rotary shaft a, substantially as set forth.

4. The combination of a rotatable shaft a supported in suitable bearings, the oscillatory shaft c, the fixed eccentric D mounted on the shaft a the pivoted forked lever H engaging said eccentric, the pinion e keyed to the shaft c, the pivoted lever Z engaging the pinion e, and suitable means of engagement between the lever H and lever Z, whereby the shaft c will be oscillated by the rotation of the shaft a, substantially as set forth.

5. The combination of the rotatable shaft adapted to be rotated in either direction, fixed and loose eccentrics mounted on said rotatable shaft and formed with tappets which are adapted to engage each other, and suitable levers engaged respectvely by said eccentrics, whereby the shaft may be run for nearly a complete revolution when reversing, before the mechanism controlled by theloosc eccentric will be operated, substantially as and for the purpose explained.

In witness whereof I have hereunto set my hand in presence of two witnesses.

VACLAV TOMSA.

Witnesses:

TH. WALDAPFEL, AnoLPH FISCHER.

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